EP3789098A1 - Sammelsystem der festen teilchen, die sich am boden einer unterwasserstation zur öl-/wassertrennung ansammeln - Google Patents

Sammelsystem der festen teilchen, die sich am boden einer unterwasserstation zur öl-/wassertrennung ansammeln Download PDF

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Publication number
EP3789098A1
EP3789098A1 EP20190847.2A EP20190847A EP3789098A1 EP 3789098 A1 EP3789098 A1 EP 3789098A1 EP 20190847 A EP20190847 A EP 20190847A EP 3789098 A1 EP3789098 A1 EP 3789098A1
Authority
EP
European Patent Office
Prior art keywords
oil
water separation
separation station
water
drainage channel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20190847.2A
Other languages
English (en)
French (fr)
Inventor
Carlos Alberto Capela Moraes
Sadia BANINI SHAIEK
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Saipem SA
Original Assignee
Saipem SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Saipem SA filed Critical Saipem SA
Publication of EP3789098A1 publication Critical patent/EP3789098A1/de
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/06—Arrangements for treating drilling fluids outside the borehole
    • E21B21/063—Arrangements for treating drilling fluids outside the borehole by separating components
    • E21B21/065—Separating solids from drilling fluids
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/36—Underwater separating arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B01D17/0214—Separation of non-miscible liquids by sedimentation with removal of one of the phases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/12—Auxiliary equipment particularly adapted for use with liquid-separating apparatus, e.g. control circuits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/001—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor specially adapted for underwater drilling
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/08—Controlling or monitoring pressure or flow of drilling fluid, e.g. automatic filling of boreholes, automatic control of bottom pressure

Definitions

  • the present invention relates to the general field of underwater production at great depths of hydrocarbons, in particular of oil and gas. It relates more specifically to the evacuation of solid particles which accumulate during the elimination of the water which is produced during such underwater production of hydrocarbons.
  • the configuration generally adopted is that of the connection of the subsea production wells, directly or through the intermediary of a subsea collector, to a plant. of floating production.
  • This plant generally consists of a floating unit intended for the production, storage and unloading of oil (called FPSO in English for “Floating production storage and offloading”) to an oil tanker which regularly comes to moor at a fixed location on the surface of the sea, near the underwater production field to collect the oil produced.
  • FPSO floating production storage and offloading
  • the FPSO with primary production facilities on its deck, usually performs the separation and treatment of production fluids (gas, oil and produced water).
  • production fluids gas, oil and produced water
  • the conventional surface treatment installation is made up of hydrocyclones deoiling, possibly supplemented by a degassing and / or flotation unit in order to allow it to be emptied at sea with a reduced oil content (usually less than 30 ppm).
  • this subsea configuration can significantly increase the production of oil due to the reduction in the pressure at the wellhead by eliminating the column of oil. water in the riser to the floating production unit (the FPSO).
  • the flow from the production wells passes through a continuously operating multiphase cyclonic desander (preferably with a ceramic coating) which removes most of the sand load, including in the event of a sudden increase in sand, continuously.
  • the low-pressure slurry stream from the multiphase grit trap is "pumped" by a slurry ejector (having an internal ceramic coating to increase resistance to erosion), which is driven by a motor flow at the bottom. high pressure water.
  • Hydrocarbon, water and gas effluents from the multiphase sand trap - without most of the sand charges, eliminated by this device - are conveyed to an underwater oil / water separation station, for example in a modular device liquid / liquid gravity separation consisting of a plurality of pipes forming parallel loops (called coils) which can be installed on the seabed (separator called “SpoolSep” by the Applicant).
  • an underwater oil / water separation station for example in a modular device liquid / liquid gravity separation consisting of a plurality of pipes forming parallel loops (called coils) which can be installed on the seabed (separator called “SpoolSep” by the Applicant).
  • the amount of sand that can settle inside the pipes will probably be very small and will likely be very small particles, as the upstream multi-phase grit trap will remove most of the sand load and the most large particles.
  • the oil / water separation station is expected to operate for several years while operating on the seabed, and even small amounts of tiny solid particles can form a significant layer at the bottom of the pipes, if not. not periodically withdrawn.
  • the main aim of the invention is therefore to provide a system for collecting solid particles accumulating at the bottom of an underwater oil / water separation station which does not have the aforementioned drawbacks.
  • this object is achieved by means of a system for collecting solid particles accumulating at the bottom of an underwater oil / water separation station of an underwater water elimination installation.
  • a system for collecting solid particles accumulating at the bottom of an underwater oil / water separation station of an underwater water elimination installation comprising at least one vertical drainage channel intended to lead inside a lower part of a horizontal body of the oil / water separation station, a discharge pipe intended to be positioned horizontally under said horizontal body of the oil / water separation station and into which the drainage channel emerges, and a high-pressure slurry ejector having a suction port connected to the pipe evacuation by means of a supply valve.
  • the collection system according to the invention is remarkable in that it has a passive network of pipes connected to a high-pressure liquid sludge ejector, which allows the continuous and periodic elimination of the sand accumulated in the bottom of the body. of the oil / water separation station.
  • the collection system according to the invention is of simplified design and maintenance and of great reliability, in particular immune to failures.
  • the collection system according to the invention makes it possible to clean each pipe of the body of the oil / water separation station independently by removing the accumulated deposits, which makes it possible to avoid making the oil / water separation station totally inoperative during this cleaning.
  • this suction discharge configuration via a dedicated slurry ejector increases the flexibility of the collection system with respect to the discharge rate (by activating the motor flow), which further improves the flexibility of this withdrawal configuration.
  • continuous sand in the case of abnormal sand production from wells.
  • the regular operation of the collection system according to the invention will guarantee appropriate management of the sand bed possibly formed inside the station. of oil / water separation.
  • This collection system without parts moving parts or internal components, is extremely reliable and, if functioning correctly, it should be used periodically to avoid high concentration sludge.
  • the only valve used to allow this operation is operated remotely from the FPSO. The operating frequency is low (usually once a week or even less), which is not a problem, moreover, a connection of the flushing piping upstream of this valve can avoid the presence of sand near the valve just before closing, after a rinsing operation.
  • the body of the submarine oil / water separation station may be cylindrical and comprise in its lower part a plurality of holes spaced apart longitudinally from one another and each opening into a drainage channel.
  • the holes formed in the lower part of the body of the submarine oil / water separation station are preferably aligned along a longitudinal axis tangent to the cylindrical shape of the body.
  • the body of the submarine oil / water separation station is cylindrical and comprises in its lower part a continuous longitudinal slot opening into a drainage channel formed by two parallel plates.
  • the drainage channel advantageously comprises a plurality of spacers connecting the two plates together in order to stiffen the body of the submarine station and the drainage channel.
  • the discharge pipe has a diameter greater than the diameter of the drainage channel.
  • the suction port of the slurry ejector can be connected to a downstream longitudinal end of the discharge pipe.
  • the discharge line is connected at a longitudinal end to a high pressure water line to allow water rinsing of the discharge line.
  • the subject of the invention is also an installation for the underwater removal of the water produced during the underwater production of hydrocarbons at great depths, comprising a grit trap continuously supplied with fluids coming directly from at least one well. production of hydrocarbons, an underwater oil / water separation station supplied with fluids from the sand trap, and a system for collecting solid particles accumulating at the bottom of the oil / water separation station as defined above.
  • the oil / water separation station is a modular liquid / liquid gravity separation device, the body of which consists of a plurality of pipes forming parallel loops, the solid particle collection system comprising a positioned discharge pipe. horizontally under each pipe of the body of the oil / water separation station and a high-pressure slurry ejector common to all the discharge pipes.
  • a further subject of the invention is a method for controlling the installation as defined above, in which the sand trap, the oil / water separation station, and the solid particle collection system are put into continuous operation, the The high pressure slurry ejector feed valve being periodically opened to allow cleaning of solid particle deposits in the discharge line of the solid particle collection system.
  • the invention applies to the production and underwater treatment of hydrocarbons, in particular oil and gas, at great depths (that is to say greater than 700 meters) from oil fields which have a growing increase in the production of water content. It relates more specifically to the collection (or elimination) of solid particles accumulated in the oil / water separation station of the installation for the underwater elimination of the water produced.
  • the figure 1 represents an example of an installation for the subsea production of hydrocarbons 2 at great depths from an oil production field 4.
  • a deep sea oil production field is operated at a water depth of between 1000m and 3000m. It consists of a plurality of hydrocarbon production wells intended to collect oil and gas from an oil reservoir in the reservoir rock.
  • the extracted hydrocarbons are typically sent to a surface production unit 6, for example a floating unit intended for the production, storage and unloading of oil (referred to in English as FPSO for “Floating production storage and offloading”), by the intermediate of submarine pipes and risers (not shown).
  • a surface production unit 6 for example a floating unit intended for the production, storage and unloading of oil (referred to in English as FPSO for “Floating production storage and offloading”), by the intermediate of submarine pipes and risers (not shown).
  • the hydrocarbons extracted from the petroleum reservoir are treated at the level of the seabed in order in particular to separate the oil produced from the water contained therein and to eliminate the fine and solid particles coming from reservoir rock (sand, silt, clay, etc. - hereinafter referred to as sand).
  • the underwater hydrocarbon production installation 2 comprises in particular a grit trap 8 which is supplied with fluids from the hydrocarbon production wells 4.
  • the grit trap is a multiphase cyclonic grit trap (preferably having ceramic coating) which operates continuously to remove most of the sand load, even in the event of a sudden increase in sand.
  • the low pressure slurry stream from the grit trap 8 is continuously sucked by a slurry ejector 10 (preferably having an internal ceramic coating in order to increase the resistance to erosion), which is driven by a high pressure water motor flow controlled by the supply valve (all or nothing) 34.
  • the liquid sludge flow is then sent to the production unit 6 to be treated.
  • hydrocarbon, water and gas effluents from the grit trap 8 (without most of the sand charges, eliminated by this device) are conveyed to an underwater oil / water separation station 12.
  • FIG. 1 Different types of submarine oil / water separation station can be used.
  • a modular liquid / liquid gravity separation device whose body consists of a plurality of pipes 14 of cylindrical shape, without internal elements and forming parallel loops (called coils, four in number on the example of the figure 1 ) which can be installed on the seabed due to their reduced diameter providing high resistance to external / internal differential pressure.
  • SpoolSep modular liquid / liquid gravity separation device
  • the high length and circular cross section of the pipes of this separation device enables high differential pressure resistance to be achieved in a relatively low weight configuration.
  • its modular configuration allows flexible installation conditions, even for high capacity systems (high inlet flow).
  • this device allows the primary separation of raw bulk water at any desired pressure, especially at low pressure, regardless of the surrounding pressure (water depth).
  • this submarine oil / water separation station 12 also comprises a hydrocarbon inlet 12a, an oil and gas outlet 12b which is connected to the production unit 6 at the surface via a riser by means of a pump 51, and a water outlet 12c which is for example intended to be connected by means of a high-pressure pump 52 to a preferably flat oil / water separation tank by gravity 18 resting on the bottom marine.
  • an evacuation pipe 20 is positioned horizontally under the body of the oil / water separation station 12.
  • a discharge pipe 20 is positioned under each pipe 14 forming the parallel loops.
  • the collection system also comprises a plurality of vertical drainage channels 22 which are each intended to open out inside a lower part of the pipes 14 of the oil separation station. / water and open in the drain line.
  • the lower longitudinal axis T which is tangent to the cylindrical body of the pipes 14 of the oil / water separation station has a plurality of holes 24 which are longitudinally spaced from each other and which each open into a drainage channel 22.
  • the drainage channels 22 (and the holes 24) have a diameter d which depends on the diameter of the pipe 14 of the oil / water separation station, and which is sized to drain the liquid slurry at low speed. Typically, this diameter d is of the order of approximately 2 to 8 mm.
  • the drainage channels 22 are devoid of internals and vortex breakers on the top, that is to say pieces of vertical pipe of small diameter, opening at the bottom of the pipes 14. This configuration is intended to avoid any device that can be clogged with liquid sludge.
  • the distance between the holes 24 at the bottom of the pipes 14 of the oil / water separation station that is to say the distance between two consecutive drainage channels 22 is variable and calculated (by dynamic fluid analysis software) depending on the actual conditions of a particular scenario in order to limit the maximum height of the sand layer at the bottom of the pipe. Typically, this distance is around 1 m.
  • Each drainage channel 22 which leaves the pipe 14 of the oil / water separation station descends into the same horizontal discharge pipe 20 (having a diameter D greater than that of the drainage channels - generally of the order of 5 to 10 cm in diameter).
  • each horizontal discharge pipe 20 is connected to the suction port 26 of a high-pressure slurry ejector 28 by means of a supply valve 30 (of the type all or nothing).
  • each of them can have a corresponding supply valve 30 open at the same time and the sludge at the bottom of this pipe. is sucked by several vertical drainage channels 22 connected to the corresponding discharge pipe 20.
  • the suction speed is controlled by injecting high pressure water into the slurry ejector 28 via the adjustment of the opening of a modulating control valve 32 (or by the adjustment of a throttle adjustable in stages). This operation allows the suction of part of the liquid from the pipe 14 of the oil / water separation station in a controlled manner in order to avoid the formation of drainage vortices inside the pipe so as not to disturb its operation.
  • this repeated process avoids any possible compaction of the layer of particles by periodically forcing its release through the vertical drainage channels. No increase in the residual sand layer is expected, the fluid dynamics inside the body of the oil / water separation station during flushing being designed to avoid this phenomenon, according to an appropriate design of the collection system.
  • the diameter of vertical drainage channels 22 may optionally vary depending on its distance from the slurry ejector 28. This optimized configuration can be determined during the design, taking into account the specific scenario data, and will be established in order to '' obtain a suitable suction through the various vertical drainage channels.
  • a study by fluid dynamic analysis software can show that, for a specific scenario (data regarding the particle size distribution of solid particles), solid particles also having a selective distribution size can only be deposited at a certain length from the inlet of the pipes to the oil / water separation station (larger solid particles remaining near the inlet). This is likely in a widely dispersed size particle size distribution.
  • the collection system according to the invention can be provided with a non-uniform discharge pipe diameter configuration, in order to optimize the removal of the sand along the pipes of the separation station. oil / water.
  • connection of the high pressure water line 36 (used to supply the high pressure slurry ejector 28, see figure 1 ) can also be connected (by means of a valve 38) to each of the ends upstream of the horizontal discharge pipes 20 of the collection system or immediately upstream of the corresponding supply valve 30, in order to allow the flushing of the drain lines.
  • This high pressure water rinse could be performed during the final suction procedure of the bottom of the pipes of the oil / water separation station, in order to avoid the accumulation of sand upstream of the supply valve. 30 corresponding. It should be noted that during this high pressure water flushing, an increase in water flow is provided inside the horizontal discharge line during the flushing procedure, thus facilitating the drainage of the slurry. liquid. In normal operation, the expected layer of sand deposited is very small and the procedure for flushing the pipes must be frequent enough to generate only liquid sludge at low concentration and avoid any increase. height and compaction of the deposited layer, so that no blockage of the flushing piping network is possible if such operation of this system is carried out.
  • FIG. 4 represents another embodiment of the collection system according to the invention.
  • each pipe 14 of the oil / water separation station comprises in its lower part a continuous longitudinal slot 40 which opens into a vertical drainage channel 22 'formed by two parallel plates. 42, 44, this drainage channel opening into a suction pipe 20.
  • the drainage channel 22 comprises a plurality of spacers 46 connecting the two plates together.
  • the procedure for collecting solid particles must be repeated for each of the pipes of the oil / water separation station in order.
  • the duration of this operation, as well as its frequency, will be determined operationally according to the quantity of solid particles present at the bottom of the pipes, which should be very low due to the grit trap 8 operating continuously upstream, as has already been done. been explained.
  • the determination of the quantity of solid particles can be carried out using a monitoring system (sonar type, for example) or by a sand bed monitoring system or even directly evaluated by the operator by the operator. alignment of the product flow of the underwater system on a separation test station located on the FPSO (for the flushing time) to allow the evaluation of the quantity of solid particles.
  • a monitoring system sonar type, for example
  • a sand bed monitoring system aligns the product flow of the underwater system on a separation test station located on the FPSO (for the flushing time) to allow the evaluation of the quantity of solid particles.
  • This collection system without moving parts or internal components, is extremely reliable and, if functioning correctly, it is used periodically to avoid high concentration sludge.
  • the only on-off valve (one per sludge discharge line) used to enable this operation is operated remotely from the FPSO.
  • the operating frequency is low (usually once a week or even less), which is not a problem, moreover, a connection of the collection system upstream of this valve can avoid the presence of sand near the valve. just before it closes, after a rinsing operation.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Removal Of Floating Material (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Cyclones (AREA)
  • Physical Water Treatments (AREA)
EP20190847.2A 2019-09-06 2020-08-13 Sammelsystem der festen teilchen, die sich am boden einer unterwasserstation zur öl-/wassertrennung ansammeln Pending EP3789098A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1909829A FR3100460B1 (fr) 2019-09-06 2019-09-06 Système de collecte de particules solides s’accumulant au fond d’une station sous-marine de séparation huile/eau

Publications (1)

Publication Number Publication Date
EP3789098A1 true EP3789098A1 (de) 2021-03-10

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Application Number Title Priority Date Filing Date
EP20190847.2A Pending EP3789098A1 (de) 2019-09-06 2020-08-13 Sammelsystem der festen teilchen, die sich am boden einer unterwasserstation zur öl-/wassertrennung ansammeln

Country Status (4)

Country Link
US (1) US11603722B2 (de)
EP (1) EP3789098A1 (de)
BR (1) BR102020017830A8 (de)
FR (1) FR3100460B1 (de)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999035370A1 (en) * 1998-01-06 1999-07-15 Kværner Oilfield Products A.S Method of gravitation separation of a hydrocarbon flow and a pressure flush device for flushing a gravitation separator for a hydrocarbon flow
US20110139625A1 (en) * 2006-01-26 2011-06-16 Richard Arntzen Multiphase Fluid Separator
WO2011161343A1 (fr) 2010-06-23 2011-12-29 Saipem S.A. Dispositif modulaire de separation gravitaire liquide/liquide
US20150306520A1 (en) * 2014-04-29 2015-10-29 Edward J. Grave Multiphase Separation System
US9359878B2 (en) 2014-03-12 2016-06-07 Exxonmobil Upstream Research Company Split flow pipe separator
WO2019081949A1 (en) * 2017-10-26 2019-05-02 Petróleo Brasileiro S.A. - Petrobras MULTIPHASE SEPARATOR WITH RINSING SYSTEM FOR REMOVING ACCUMULATED SAND, AND PROCESS USING THE SEPARATOR

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4673500A (en) * 1985-04-15 1987-06-16 Amoco Corporation Sand separation and removal method and apparatus
US6119779A (en) * 1998-11-09 2000-09-19 Atlantic Richfield Company Method and system for separating and disposing of solids from produced fluids
US8454843B2 (en) * 2010-05-03 2013-06-04 Petroleos De Venezuela, S.A. Production fluid solid trap
WO2013029685A1 (en) * 2011-09-02 2013-03-07 Fmc Kongsberg Subsea As Arrangement for sand collection
GB2584998A (en) * 2019-06-18 2020-12-30 Equinor Energy As Removing deposits from a subsea separator

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999035370A1 (en) * 1998-01-06 1999-07-15 Kværner Oilfield Products A.S Method of gravitation separation of a hydrocarbon flow and a pressure flush device for flushing a gravitation separator for a hydrocarbon flow
US20110139625A1 (en) * 2006-01-26 2011-06-16 Richard Arntzen Multiphase Fluid Separator
WO2011161343A1 (fr) 2010-06-23 2011-12-29 Saipem S.A. Dispositif modulaire de separation gravitaire liquide/liquide
US9359878B2 (en) 2014-03-12 2016-06-07 Exxonmobil Upstream Research Company Split flow pipe separator
US20150306520A1 (en) * 2014-04-29 2015-10-29 Edward J. Grave Multiphase Separation System
WO2019081949A1 (en) * 2017-10-26 2019-05-02 Petróleo Brasileiro S.A. - Petrobras MULTIPHASE SEPARATOR WITH RINSING SYSTEM FOR REMOVING ACCUMULATED SAND, AND PROCESS USING THE SEPARATOR

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Publication number Publication date
FR3100460A1 (fr) 2021-03-12
US11603722B2 (en) 2023-03-14
FR3100460B1 (fr) 2021-08-06
BR102020017830A8 (pt) 2023-12-05
BR102020017830A2 (pt) 2021-04-20
US20210071488A1 (en) 2021-03-11

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